Once you're past the traps, you'll find a pair of Mordrem Controllers nurturing Immature Mordrem Wolves. The wolves die easily but have might and regeneration. The controllers function similarly to the Tormenters, but the pedestals they're standing on apply massive poison debuffs, so ranging them down is the safest bet.

Taimi needs bones, and you're going to use the mushrooms at the cave mouths to draw out the saurians. Bristlebacks, Rolling Devils, or Smokescales can spawn. They come alone and can be handled as they would be normally. Once you've killed four and used their bones on the inactive pylons, you'll reactivate the apparatus and get to watch some lengthy dialogue.

Then reunite with the party. Do not use the available waypoint, as this places you outside of the instance. Instead, escort Taimi out and to the left through a tunnel.

The spike traps will trigger when active and your character is on them. Time your movements or use teleports. Eligibility is shown by the Qualify for Avoid Traps effect on the player's bar.

The Druid's Ancestral Grace can be used to bypass the traps. Although you will still trigger the traps as a wisp, and the "Qualify for..." effect disappears, you won't be caught up in the traps, and still get the achievement.

While the controllers are on the platforms, you will be knocked off when you try to stand on them. The controllers grant might and regen to the wolves, and fire tormenting projectiles and lay down crippling expanding fields. Upon death, they enrage nearby wolves.

While standing on the platforms, you will be applied with a poison debuff and your weapon skills will be replaced with

Focused Corruption. Use that skill to kill the wolves, and optionally the controllers. If the wolves die from other sources of damage, the achievement will fail. Eligibility is shown by the Qualify for Mordremoth Usurper effect on the player's bar.

Tasty Mushrooms only last for 30 seconds both as a bundle and on the ground. Throwing the mushroom or picking up the thrown mushroom resets the timer. Dropping the bundle using weapon swap destroys the bundle. One mushroom can be used to lure up to 6 saurians by utilizing the timer, allowing a larger margin of error.

Saurian Bones only last for 60 seconds after killing the saurian. Picking the bone does not reset the timer. Dropping the bundle using weapon swap destroys the bundle.

Basically, pick up a tasty mushroom, move in to a cave, toss the mushroom at your feet, then pick it up again when the saurian spawns and move to the next cave. After you spawn 4 saurians, you can get rid of the mushroom and kill each one by one and complete the task and achievement. Eligibility is shown by the Qualify for Mushroom Conservationist effect on the player's bar.

I caught up with Taimi, who had wandered away from the group, and we discovered an observatory created jointly by the Exalted and asura. It revealed a map of the area marked with ley-energy concentrations. One may be a place called Rata Novus — a legendary, lost asuran outpost where we might find allies in the battle against Mordremoth. Taimi was over the moon.